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Old 11 Apr 2013, 07:28 AM   #1 (permalink)
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Question coolant overflow

The other night I went out to check my oil level and noticed a small wet patch under the front of the engine on the ground.
Opened the bonnet and there was some green anti-freeze lying on the tray at the bottom, behind the rad and infront of the engine.
Looks like it had been pushed out the top of the expansion bottle (to the right of the rad).

The expansion bottle level looked ok (exactly on the full mark when cold), checked oil looked ok, not discoloured.
Rinsed everything away from the tray using water.

I've been driving the car fairly hard since to see if it could be pressure coming out the engine and pushing coolant out the bottle - but nothing.
It hasn't happened again. I've checked the oil after each journey, and checked the coolant level and colour - all looks fine.

Should I just put the down to maybe it was too full to start with and the excess has just pushed out the bottle when driving?

Obviously my worst thought is head gasket failure - but hopefully not!
Car is a STi330S with only 23k miles. Still under warranty for another 7 months.
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Old 11 Apr 2013, 03:17 PM   #2 (permalink)
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Re: coolant overflow

get a sniffer test done dude, also could there be an air lock or possible pin hole in one fo the hoses somewhere?
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Old 16 Apr 2013, 07:06 PM   #3 (permalink)
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Re: coolant overflow

So I think I have gotten to the bottom of this.
I had been monitoring it and no more coolant loss. I decided to pressure test the coolant system - luckily I work for a radiator manufacturer and so have access to a pressure test kit.
I left the rad cap in place and pressurised from the filler next to the turbo. Pressured to 20psi as this is the rating on the rad cap. Pressure didn't hold and dropped to 12psi! So escaping somewhere and fast.
I noticed as the pressure was dropping the expansion bottle was filling. So it looks like my rad cap is faulty and releasing at only 12 psi.
I have now confirmed this by testing the rad cap itself and its definitely not holding pressure.

We actually stock most rad caps at my work but nothing as high as 20psi for automotive.
Even the ones I see online as updated racing caps aren't as high as 20psi (137kpa). So my new problem is finding a new cap.
But at least it looks like its a simple fix rather than something more serious.
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Old 17 Apr 2013, 12:42 PM   #4 (permalink)
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Re: coolant overflow

how much is a new one from a dealer?
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Old 17 Apr 2013, 03:49 PM   #5 (permalink)
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Re: coolant overflow

35 !
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Old 17 Apr 2013, 04:42 PM   #6 (permalink)
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Re: coolant overflow

import car parts ?
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Old 24 Apr 2013, 07:10 AM   #7 (permalink)
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Re: coolant overflow

Well I got a genuine subaru rad cap and been running with it for a week.
I'm now just keeping an eye on things and hopefully problem sorted.
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